you only have about 24 days, and barrons is a lot of material. give yourself more time to digest it, provided you dont have to take anything else in october. I personally like both barron's ap chem and satII chem book and I would recommend using both of them to prep for the SATII. You are already in a good score range, you just need to bring it up a bit. Barrons wil lhelp you get some of that random trivia they put on there. and some questions that were in barrons showed up on there almost word for word... Good luck! ~Kiwi